备忘录（Memento）模式

            Originator o = new Originator();
            o.State = "On";
            o.Show();

            Caretaker c = new Caretaker();
            c.Memento = o.CreateMemento();

            o.State = "Off";
            o.Show();

            o.SetMemento(c.Memento);
            o.Show(); 

    /// <summary>
    /// 发起人
    /// </summary>
    public class Originator
    {
        public string State
        { get; set; }
        public Memento CreateMemento()
        {
            return (new Memento(State));
        } 
        public void SetMemento(Memento memento)
        {
            State = memento.State;
        } 
        public void Show()
        {
            Console.WriteLine("State=" + State);
        }  
    }
    /// <summary>
    /// Memento（备忘录）
    /// </summary>
    public class Memento
    {
        public string State
        { get; set; } 
        public Memento(string state)
        {
            this.State = state;
        }  
    }
    /// <summary>
    /// Caretaker（管理者）
    /// </summary>
    public class Caretaker
    {
        public Memento Memento
        { get; set; } 
    }    

            Console.WriteLine(" 数据初始化：");
            GameWuZhunShen WuZhenShen = new GameWuZhunShen();
            WuZhenShen.HP = "75120";
            WuZhenShen.MP = "175120";
            WuZhenShen.AP = "15120";
            WuZhenShen.SP = "3120";
            WuZhenShen.Show();

            Console.WriteLine(" \n保存数据：(=========)");
            GMCaretaker GM = new GMCaretaker();
            GM.WuZhunShen = WuZhenShen.SaveState();

            Console.WriteLine(" \n参战后数据：");
            WuZhenShen.HP = "5120";
            WuZhenShen.MP = "5720";
            WuZhenShen.AP = "15120";
            WuZhenShen.SP = "3120";
            WuZhenShen.Show();


            Console.WriteLine(" \n恢复数据：");
            WuZhenShen.SetState(GM.WuZhunShen);
            WuZhenShen.Show();   

    /// <summary>
    /// 游戏角色 -- 武尊神
    /// </summary>
    public class GameWuZhunShen
    { 
        //属性值 
        public string HP
        { get; set; } 
        public string MP
        { get; set; } 
        public string AP
        { get; set; } 
        public string SP
        { get; set; } 
        //保存数据
        public WuZhunShenMemento SaveState()
        {
            return new WuZhunShenMemento(HP, MP, AP, SP);
        } 
        //读取保存的数据
        public void SetState(WuZhunShenMemento wuZhunShen)
        {
            HP = wuZhunShen.HP;
            MP = wuZhunShen.MP;
            AP = wuZhunShen.AP;
            SP = wuZhunShen.SP;
        } 
        public void Show()
        {
            Console.Write(" 武尊神：\n");
            Console.Write(" HP：‘{0}‘\n", HP);
            Console.Write(" MP：‘{0}‘\n", MP);
            Console.Write(" AP：‘{0}‘\n", AP);
            Console.Write(" SP：‘{0}‘\n", SP);
        }
    }

    /// <summary>
    /// 游戏角色备忘录
    /// </summary>
    public class WuZhunShenMemento
    {
        //属性值 
        public string HP
        { get; set; } 
        public string MP
        { get; set; } 
        public string AP
        { get; set; } 
        public string SP
        { get; set; } 
        public WuZhunShenMemento(string _HP, string _MP, string _AP, string _SP)
        {
            HP = _HP;
            MP = _MP;
            AP = _AP;
            SP = _SP;
        } 
    }

    /// <summary>
    /// 系统管理者
    /// </summary>
    public class GMCaretaker
    {
        public WuZhunShenMemento WuZhunShen
        { get; set; }
    }